# Integration of second order partial derivative

1. Nov 14, 2011

### hermano

1. The problem statement, all variables and given/known data

Hi,

I have to solve a boundary condition problem but therefore I have to integrate a second order partial derivative. However, I don't know how to integrate the equation two times. Can someone explain this step by step how I get this solution?

2. Relevant equations

$\int\frac{\partial^2u}{\partial y^2}= \int\frac{1}{\mu}\frac{\partial p}{\partial x}$

3. The attempt at a solution
$u = \frac{1}{2\mu}( \frac{\partial p}{\partial x} ) y^2 + C1 y + C2$